Abstract
The LB SPR approach is needed to predict the ability of stock reproduction as a function of recruitment and stock sustainability. Therefore, we try to apply this technique for demersal exploited stock (Priachanthus tayenus) in Sunda Strait. The length data were collected in 2013, 2015, 2016, and 2019 by a research team from Labuan landing port. Data analysis consists of length frequency, size at maturity, selectivity, and SPR by using software from http://barefootecologist.com.au/lbspr. Results have shown asymptotic Length 320,25 mm, length at maturity (Lm50) 201,4 mm, von Bertalanffy growth rate 0,136, and ratio M/k 1.56. The SPR of P. tayenus range from 6-36% (average 16%), and it's relatively under 40% and potentially unsustainable. The length at selectivity 50 percent (SL50) ranges from 154-261.36 mm and length selectivity at 95% (SL95) from 179-348.48 mm. In the 2013-2019 period, SPR was relatively fluctuating and tended to decrease, as indicated by a decrease in the length of the gonad maturity (50% and 95%) of the population. The spawning potential ratio between 6%-36% (average 16%) from 2013-2019 shown an over-exploited stock and potentially high risk to sustainability stock.
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